The mirror management console is provided only for the individual mirror resources managed by MCCS.
The mirror management console operates independently from the engine logic of MCCS, so during operation, it can collide with MCCS.
The mirror management console informs users of the mirror volume status and the capacity of the mirror in use. You can change the bandwidth and the mirror network addresses in it.

Table of Contents

Screen configuration

Mirror management screen

The following mirror management screen is used.

MCCS 4.1 English Online Help > Appendix H. Mirror Management Console > 1.PNG

[Figure] Mirror management screen

Mirror set configuration

The mirror resource configured in MCCS is expressed as a single mirror set.

	Figure	Description
Volume		The volume role is Source. Displays the capacity in use on the right side of the volume.
Volume		The volume role is Target.
Status		The status is Mirroring.
		The status is Resyncing. Displays the progress for resyncing.
		The status is Paused.
		There is a dirtybit in the volume.
		Split brain occurred.

Mirror management command descriptions

Right click with your mouse button on the mirror set volume to see the descriptions of the mirror management commands that can be selected.

	Menu	Description
Source	Pause	The mirror status will be changed to PAUSE and replication will be paused.
	Resync	The mirror status will be changed to RESYNCING and the full synchronization will be initiated between node.
	Resume	Resume MIRRORING the mirror disk which was paused. Resynchronization will take place in advance, if there is data change during paused.
Target	Lock	The volume is locked to prevent access the volume from the node.
	Unlock	Unlock the target volume to access read only purpose. Mirror status should be paused in advance.

When you unlock the target volume, you can access the volume read only purpose. It can cause a negative effect to the mirror.
Even if you unlock it, you cannot write to the disk. If you want to "write" to the disk, you must manually change the readOnly attributes in the registry. But it does not highly recommended to secure data integrity.

Descriptions of properties setting

MCCS 4.1 English Online Help > Appendix H. Mirror Management Console > 2.PNG

[Figure] Mirror Management Screen

Attribute name	Description
JOB ID	JOB ID is displayed.
Bit Map	It is the directory containing the intent log.
Compression level	It represents the compression level for a specific copy set. The setting range is from 0 to 9. ‘0’ means no compression. The greater the value is, the smaller bandwidth is used to transmit greater data. But also, it uses more of the CPU resources. Thus, by properly balancing the system CPU usage and the network bandwidth, select the proper compression level that can maximize the efficiency.
Empty async queue	Even if a driver receives a request for deleting a queue, this function can be used to prevent deletion of queues on a specific volume.
Bandwidth	It is the max network bandwidth (kbps/sec) that can be used by a copy set. ‘0’ means that the given bandwidth will be used with maximum efficiency.
Mirror network address	IP address of mirror disk between nodes in a cluster.

Screen configuration

Shared disk DR management screen

Shared disk DR management screen is as follows.

MCCS 4.1 English Online Help > Appendix H. Mirror Management Console > sdr_h.PNG
[Figure] Shared Disk DR Management Screen

Node access status

It represents the status of node accessing the shared disk.
MCCS 4.1 English Online Help > Appendix H. Mirror Management Console > SDRNode.PNG

[figure] Shared disk DR node access status

Figure	Description
	Both nodes accessing the volume
	Active1 node accessing the volume
	StandBy1 node accessing the volume
	Neither of nodes accessing the volume

Mirror set configuration

The shared disk DR resource configured in MCCS is expressed as a single mirror set.

	Figure	Descriptions
Volume		The disk status in the Primary site. The capacity in use is displayed on the right side of the volume.
Volume		The disk status in the off-site DR.
Status		The volume in the MIRRORING status.
		Volume in the RESYNCING status. The progress bar is displayed during RESYNCING .
		The volume in pause status.
		Dirtybit occurred in the volume.
		split-brain occurred
		DR volume status in NONE.

Shared disk DR management menu

Right click with your mouse button on the mirror set volume in mirror volume to see the descriptions of the mirror management commands that can be selected.

	Menu	Descriptions
Source	Pause	The mirror status will be changed to PAUSE and replication will be paused.
	Resync	The mirror status will be changed to RESYNCING and the full synchronization will be initiated between node.
	Resume	Resume MIRRORING the mirror disk which was paused. Resynchronization will take place in advance, if there is data change during paused.
Target	Lock	The volume is locked to prevent access the volume from the node.
	Unlock	Unlock the target volume to access read only purpose. Mirror status should be paused in advance.

When you unlock the target volume, you can access the volume read only purpose. It can cause a negative effect to the mirror.
Even if you unlock it, you cannot write to the disk. If you want to "write" to the disk, you must manually change the readOnly attributes in the registry. But it does not highly recommended to secure data integrity.

Shared disk DR Properties

MCCS 4.1 English Online Help > Appendix H. Mirror Management Console > SDRProp.png
[Figure] Shared Disk DR Management Screen

Attribute name	Descriptions
JOB ID	JOB ID is displayed.
MirrorEndPoints	Shows the information of all jobs defined in the mirror. (Node name, Letter, MirrorIP, Mirror mode)
Compression level	It represents the compression level for a specific copy set. The setting range is from 0 to 9. ‘0’ means no compression. The greater the value is, the smaller bandwidth is used to transmit greater data. But also, it uses more of the CPU resources. Thus, by properly balancing the system CPU usage and the network bandwidth, select the proper compression level that can maximize the efficiency.
Flush Async Queue	Even if a driver receives a request for deleting a queue, this function can be used to prevent deletion of queues on a specific volume.
Bandwidth	It represents the max network bandwidth (kbps/sec) that can be used by a copy set. ‘0’ means that the given bandwidth will be used with maximum efficiency.
Mirror network address	IP address of data replication between a cluster and an offisite DR.